

The 6th Gen Ford Bronco Rock Krawler RK08388K Billet Aluminum Upper-A Arms are precision-machined from 6061-T651 aluminum for durability and lightweight performance. Adjustable for optimal alignment, they feature service-free joints and Quiet Control ball joints. Easy to install with a lifetime warranty, these A arms provide silent, smooth operation.
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Vehicle Fitment:
Physical products may be returned within 30 days for any reason, provided that the product has not been installed and is in brand new, unused condition with the original packaging. Once a product has been installed, it is non-refundable.
Digital Products, such as MPT Tunes and HP Tuners Credits, are not covered by this.
Please see our Refund Policy or contact an MPT Expert for more information.
MPT is proud to offer free shipping on most orders over $149.
Free Shipping applies only to the contiguous United States. Shipping and handling charges will apply to all orders outside the contiguous US, with the buyer being responsible for any duty fees or taxes their home country may charge to import goods.
With Free Shipping, we will choose the best shipping method for the order. We use all major carriers, including USPS, FedEx, UPS, and DHL.
Items not stocked at our location may incur additional lead-time or charges.
Please our Shipping Policy for more information.


Proposition 65 (Safe Drinking Water and Toxic Enforcement Act of 1986) is a California law that applies to all companies selling products in California. Proposition 65 requires warnings if a product contains any listed chemical present above very low levels that are known to cause cancer, birth defects or other reproductive harm. Proposition 65’s warning standards are among the most stringent in the world. Proposition 65 is not a product safety law, but rather a “right-to-know” law. Businesses are required to provide warnings to comply with Proposition 65. These warnings are required to be in place for all products offered for sale in California.
There are over 800 chemicals on the Proposition 65 list, which is administered by California's Office of Environmental Health Hazard Assessment (OEHHA), a part of the California Environmental Protection Agency. The list includes naturally occurring and man-made chemicals. Proposition 65 warnings can be seen for a wide variety of everyday consumer products, including Automotive Performance products, and warnings can be seen posted throughout California in a variety of establishments such as hotels, restaurants, automobile dealerships/repair shops, and retail stores just to name a few.
To comply with the requirements of Proposition 65, this warning is present on all products sold by MPT.
More detailed information can be found by going to:
https://www.p65warnings.ca.gov/
The 6th Gen Ford Bronco Rock Krawler RK08388K Billet Aluminum Upper-A Arms are a masterpiece designed to enhance the performance and style of your Bronco. Machined from solid 6061-T651 billet aluminum, these A arms offer unmatched strength and durability while maintaining a lightweight build. Featuring an adjustable design, they allow you to fine-tune your caster and camber for optimal alignment and improved driveability. With service-free, free-rotating Adventure Series joints and Quiet Control ball joints, these A arms provide superior functionality, smooth operation, and long-lasting performance. Whether you're tackling rugged trails or cruising on the road, these are the last upper A arms you'll ever need for your Bronco.
Key Features
Benefits
Product Specs
Install Difficulty Level Installing the 6th Gen Ford Bronco Rock Krawler RK08388K Billet Aluminum Upper-A Arms is straightforward and can be completed in about 2-3 hours with basic mechanical skills. The A arms feature a complete bolt-on design, so no welding or additional modifications are required. All necessary hardware is included, and the process is simplified with clear instructions, making it a smooth upgrade for any Bronco owner.
Vehicle Fitment
For any questions about this product or to report discrepancies in the product description, contact the MPT Performance experts at (407) 636-7077 or by email.
MPT is proud to offer free shipping on most orders over $149.
Turnaround Times:
Special Considerations:
A Return Authorization Number is required for all returns. Please contact an MPT Expert to obtain an RA # before sending anything back to us for any reason.
MPT tuning charges and license fees are Non-Refundable. The sale is final when MPT has sent the tune file over email. This includes both new tune purchases and tune updates.
Products other than MPT tunes, digital products, and MPT decals may be returned within 30 days for any reason, provided that the product has not been installed and is in brand new, unused condition with the original packaging. Once a product has been installed it is non-refundable. We reserve the right to deny the return, should the product be received and it display signs of installation or unmentioned damage.
For vehicle programmers/tuners, the vehicle must be returned to stock if a program was installed. If a tuning device is returned and has not been returned to stock, a refund will not be issued, and your tuner will not be sent back without a shipping and handling fee.
The customer is responsible for all shipping charges incurred during the return process.
Amount Refunded:
•Returns post marked before 30 days from the date the item was received will be refunded the purchase price, minus a 25% restocking fee and the cost of shipping.
•After 30 days, all sales are Final.
•Shipping charges along with any package insurance are non-refundable. If your purchase was shipped with our Free Shipping option, the cost of the shipping will be subtracted from the total refund amount.
HP Tuners Credits are assigned to the HP Tuners product with the submitted serial number and cannot be transferred. Once you load a tune to your vehicle with the RTD, these credits are Non-Refundable.
Digital products and files that have no ability to be taken back physically, such as an SCT Tuner Unlock, are Non-Refundable.
nGauge Tune License Fee is included in your initial purchase of MPT tunes for the nGauge. This fee is factored into the price of the tunes and becomes Non-Refundable when the stock file has been emailed to MPT.
MPT Decals are Non-Refundable, once they have been received by the customer.
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2021-2024 | Ford | Bronco | Badlands |
| 2021-2023 | Ford | Bronco | Base |
| 2021-2024 | Ford | Bronco | Big Bend |
| 2021-2024 | Ford | Bronco | Black Diamond |
| 2022-2024 | Ford | Bronco | Everglades |
| 2021 | Ford | Bronco | First Edition |
| 2023-2024 | Ford | Bronco | Heritage Edition |
| 2023-2024 | Ford | Bronco | Heritage Limited Edition |
| 2021-2024 | Ford | Bronco | Outer Banks |
| 2021-2024 | Ford | Bronco | Wildtrak |
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